Telephone-exchange system.



W. P. ALBERT TELEPHONE EXCHANGE SVSTiM.

APPLICATKON FILED NOV 21. 19:3

1,274,658. Patenhd Aug. 6, 1018.

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TELEPHONE EXCHANGE SYSTEM APPLICATION FILED N0v'.2!,19|3. 1,274,658.Patented Aug. 6, 1918.

W. P. ALBERT.

TELEPHONE iXCHANGE SYSTEM.

APPLICATiON HLED NUV.2I.1913.

Patented Aug. 6, 1918.

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W. F. ALBERT.

TELEPHONE EXCHANGE SYSTEM.

APPLECATION FILED NOV. 2!. I913- 1,274,658. Patented Aug. (5, 1918.

16 SHLFYE" SHEET 4.

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TELEPHONE EXCHANGE SYSTEM.

APPLICAHQN mm NOV. 21. 1913.

1,274,658. Patented Aug. 6; 1918.

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TELEPHONE EXCHANGE SYSTEM.

APPUCAHUN FILED NOV. 21. m3.

1,274,658. Patented Aug. 6, 1918.

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W. P. ALBERT.

TELEPHONE EXCHANGE SYSTEM.

APPLICATION man NOV. 21.1913.

1,274,658. BatentedAug. 6; 1918.

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TELEPHU MTHA 1E SYSTEM.

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W. P. ALBERT.

TELEPHONE EXCHANGE SYSTEM" APPUCATION FILXED NOV. 2|. 19H,

Patented Aug. (3, 1918.

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TELEPHONE EXCHANGE SYSTEM.

APPLIEATIUN FiLED NQV. 21. m3

1,274,658. Paivntud A 11g. 6, 1918.

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TELEPHONE EXCHANGE SYSTEM.

APPLICATION FILED Nov. 21. mm.

1,274,658. Patented Aug. (3, 1918.

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TELEPHONE EXCHANGE SYSTEM APPLICAHON FILED NOV. 2)! i913.

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W. F" ALBERT.

TEMPHWJE ULQJATJFF SYSTEM.

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my "a? r-a w UNITED STATES PATENT OFFICE.

WALTER P. ALBERT, OF CHICAGO, ILLINOIS, ASSIGNOR. BY MEBNE ASSIGNMENTS,T0 JAMES R. GARFIELD, TRUSTEE, OF CLEVELAND, OHIO.

TELEPHONE-EXCH4KNGE SYSTEM.

Specification of Letters Patent.

Patented Aug. 6, 1918.

Application filed November 2!. 1013. Serial No. 802,249.

To all whom it may concern.-

Be it known that I, VVMrrrzn I..A|.nnn'r. a citizen of the UnitedStates, residing at Chicago, in the county of (00k and State ofIllinois, have invented certain new and useful Improvements inTelephone-Exchange Systems, of whichthe following is a specification.

My invention relates to telephone can change systems and especially tothat. type wherein automatic switching mechanism is used forinterconnecting subscribers lines. In systems of this class subscrilwrsmay directively control the action of the. auto matic switchingmechanism by nmnipulating suitable sending devices, located at thesubstations or the mechanism can he controlled by operators located atthe central or sub-exchange as the case may be. 1

The latter method of control is used in What is termed thesemi-automatic system and with which I have shown my invention asapplied.

It will of course be noted. however, that. my invention is alsoapplicable to the first class known as the full automatic system.

I have used automatic step by step switches for extending the calls tothe called subscribers. Such switches are commonly known as firstselector, second selector and connector switches.

The calling subscribers lines however, are automatically extended toidle, operators ositions by means of relays. The calling inc is firstconnected t' an idle primary trunk by means of a se of associated tensand units relays. Second; the prim. ry trunk is autometic'nlly'donneoted to asecondary trunk by means of a set of associated hens andunits relays. Third, the secondary trunkis finally connected to atertiary trunk or keyse't by means of a set of associated tens and unitsrelays;

Each operators position is preferably equippedwith three keysets soarranged to allow calls to be answered and extended withoutiloss oftime.

The various sets or groups of tens and units relays associated with theprimary, secondary and tertiary trucks are controlled by groups ofcontrol relays and emergency or guarding switches. v j

One feature of my invention relates particularly to the manner in whichthe various control circuits comprising relays and switches arearranged.

Another feature of my invention relates to the manner in which thesending devices nsstariated with the keyscts are controlled. 'lhescsending devices determine the action of the various selector andconnector switches. 7

Still another feature of my invention relates to the manner in which theringing cur rent is (onnected to the called subscriber's line. A specialform of switch associated with each onncctor snitch is so arranged as toapply ringin; current in a predetcr mined manner. llach ringingswitchncts iinlcpenrh-ntly ot' the other ringing switches and besides applyingringing current also ser es to discharge the line so as to prevent theline discharge from affecting the connection during the non-ringinginterval. The ringing switch and circuits are s arranged as to applyringinp current to the called lino soon as connection is reflectedtherewith by its tlhntltltllt'tl onnector switch thereby preventing anyltl$ of time.

Various other novel features will be pointed out in the dctiiilcddescription to fol low.

The method of forming: cross combinations between sets of tens and unitsrelays is disclosed in Letters l'atcnt iliilhlt ti to ll. R. (lenient.November L 11am In the present system however this plan is enlarged uponand the method of controlling the action of the tons and units relays isentirelcy differ out as will readily be. noted in description anddrawings.

My invention is illustrated in the accompanying drawings wherein:

Figure 1 shows a group of subscribers line circuits and a series of tensand units relays for effecting connection between calling lines andprimary trunks.

Fig. 2 shows a primary,tru k with its associated first selector switchFig. 3 shows a second selectdr switch.

Fig. 4 shows a connector'ew'itoh with its associated switches for'party' line selective and intermittent ringing.

Fig. 5 is a tin licat on of Fig. 1 and representsicn'lled'su scribersline equipments.

Fig. 6 shows a set of relays and a switch for contrdlling a primary setof tens and units relays and primary trunks.

Fig. 7 shows a set of relays and a switch for controlling a set ofsecondary tens and 6 units rela s. I

Fig. Gallows a set of tens and units relays for effecting c'onnect'ns'lictwecn primary and secondarydruiiliig Fig. 9 shows the circuits ofa secondary trun Fig: 1(l shows the control circuits for a set of tensand-limits relays for tertiary trunks.

Fig. 11 shows a. tertiary set of tons and units releys for elfectingconnection between the secondary and tertiary trunks.

Fig. 12 shows a tertiary trunk associated with the keyboard and switchcontrolling ricc. Fig; 13 shows an tperators keyboard, and switchcontrolling evice.

ig. 1 shows the manner in which the primary eirculetor or emergencyswitch guards the primary control relays and PM" heir trunks. Fig. 15shows the manner in which the Secondary control .-ircuits are guurdml bythe circulate: or emergency switch. Fig. 16' Shows the arm ngcment ofthe vurious figures. "R,cferring to F lg. l I have shown line circuiilsfor five subscribers. Each line is proas shown with an. individual lineand ector relay all of the subscribers sub-station egui'pnhents areidentical, I have only shown one tit A. This sub-station is equippedwith a phratus usual in common battery ex angescomprising a transmitter,receiver, gerre In. this figure I have showna portion of a set of tensand units relays used for in-' tiirconnecting calling lines and primarytrunks. For each trunk there will be ten tens relays numbered 1, 2, etc,and teu units reluys numbered 11., 12. etc. Each. tens rel'a'y containsthe terminals of ten lines so it follows that for one hundred linesthere will be ten tens relays.

Vl hcre ten per cent. trunkingjs provided there will be ten setsof tensand units re- 1e comprising ten tens and ten units relays for eachprimary trunk.

Corresponding contacts in the tens relays of a certain set are multi ledand connected to contacts in the units re. eye of the same set in thefollowing manner: The multiple of number one set of contacts of the tensrela s are connected to contacts in the rst units relay of the set whilethe multipl contacts of 1; is second set of contacts. in the tensreluy-s are connected to contacts in the second units relay, etc,

W hen the 'first tens relay and the first units relay of the seine setare energized it of more than one naturally follows that the lineconnected to the first set of contacts in the first tens relay isconhected to contacts in the first units relay.

The contacts of the units relays which engage contacts leading to themultiple connections in the tens relays are connected directly toconductors leading to a particular primary trunk. When the first tonsand first units relays are en'ergiz d it naturally follows that numbereleven 1 nc will be connected to the primary trunk.

With the foregoing arrangement of tens and units relays it will be seenthat any one of one'h'undred lines can be connected to a primary trunk.By providing ten primary trunks and ten sets 'of tens and units relaysit follows that any line in a particular group of one hundred can becomeconnected to any one of ten primary trunks.

Referring to Fig. 6 I have shown a group of relays for controlling theaction of the tens and units relays in F ig. 1 end so arranged as toprevent the operation of more than one tens and one units relay in thesame set This arran einent of control relays also provides age nst theoperation of more than one tens relay and one units relay in the sameset in case two or more linesoriginate calls at the same instant.

'Ilhere will be ten relays 331, 332, etc, cacli relay containingcontacts connected to individual units contactsin a gro p of ten linerelays. There will be ten rdlays 321, 322, etc, for a. roup of onehundred lines. Each one of t use relays is common to a group of ten linerelays en any line relay of a group operates it causes the action of itsrelay 321, or 322, etc, an the action of any one of these relays t rnoperates its asst igtted relay 331' 33 2, eta, and'the operution any oneof in r relays connests tlllfi individual units stunting wires to the wiings of the unit control relays 341, 342. etc.

Each group of t s and units control relays is governed b muster relays858 and 359 respectively.

The operation of the tens and units control relaysndetggnine which tensand units relay of the primary set Fig, 1v shall be operated. In orderto prevent. the operation t n and unit P m y relay, the contacts of thetens'imd units con! trol relays Fig. 6 are arranged in a series relationso, that the o ration of but one tens and one units contra relay of theset becomes eflective. The switch K shown in Fig. 6- is arranged to-cb eorder in which ground is eomrec to the series contacts so that in caseof an open contact in'the series the switch will automaticellystep andoffset Cami i t itn n inationswhich will be 4 brought out hidetail intracing a connection. The switch K besides chm ground,

1,274.,eee

connections on the series contacts of the tens and units control relaysalso changes the order in which the various primary trunks are placed inservice.

The two master relays 358 and 359 are provided so as to prevent anychange in the operation of the tens and units control relays after themaster relays themselves are operated. The relays 331 and 332, etc.,besides containing contacts for various control circuits also containten'contacts connected to a group of units starting conuuctors.

Referring to Fig. 2 a primary trunk is shown terminatin T. Battery forta king purposes is supplied .0 the calling subscriber through thewinding relay 111 and the winding of the retar. dation coil 112. The tipand sleeve talking conductors have condensers inserted in the usualmanner. Relay 121 is operated after connection is effected between theprimary trunk and the calling line and acts in a manner similar to theline relay as it initially determines which tens and units relays of thesecondary set shall be operated. 109 is a sluggish relay controlled bythe tip relay 111 and is used to provide against aocidentaldisconnection in case thg calling subscriber shouldinadvertently operatthe receiver hook at the sub-station; Relay 113 acts as a cut-otl relayand is o rated b relay 114 whcnconn'ection is e ected wit the tertiarytrunk. 119 is the test relay and when operated causes the switch D toste automatically in a vertical direction until and idle trunk isselected. '116 is the interrupter relay the'action of which causes thevibration f the vertical magnet 118. 122 is the repeating relay andoperates in unison with the control relay located at the operatorskeyboard. 123 is the vibrating relay operated by the rotary magnet 120.124 is a slow acting relay and serves to control the shifting of thestarting conductor from its associated trunk to the next trunk in order.Referring to Fig. 3, a second selector switch is shown at E. This switchis controlled in a manner similar to that of the first selector switchI). Relay 807 operates in unison with the control relay associated withthe keyboard and causes the action of the rotary magnet 812 which causesthe switch E to step in a rotary direction. Relay 806 operates at eachstroke of the map:- not 8'12 and serves tosevcr the series relationbetween relay 807 and the control relay associated with the keyboard.Relay 809 is the rest relay and when operated segues to reuse the switchE to step vertically y clos- Eng" the circuit of magnet S13. The switchit will continue to step vertically until an nlletrunk is selected. 810is a cut-oil relay and'isused to sever the tip and sleeve con- .ductorswhile the switch is advancing or rein a first selector switch.

storin 805 is the rela o erated to control the re ease of the switch andin conjunction with the rotarv off-normal cam springs serves to renderthe switch busy until its complete restoration.

Referrin to Fig. 4, a connector switch is shown at The switch forselecting the proper frequency or character of generator current to beused is shown at Y. This switch in addition to selecting the propergenerator current also serves to restore the switch G to itsnormalposition.

The switch Z is used for intermittently applying generator current ofthe character selected to the called line. This switch Z is providedwith three cams 924, 925, and 926, operetedby the stepping magnet 920.The switch Z'in addition to applying generator current tothe called linealso serves to discharge t.he line during ringing intervals so as toprevent the remature operation of the tip relay 916. attery supply isfurnished to the called subscriber through the windi of relay 916 andthe retardation coil 918. clays 910, and 911 when operated in unisonwith the control relay associated with the keyboard serve to control theaction of the switch G and also the action of the switch Y. 913 is etedby the magnets of the switch G and by the magnet of the switch Y andwhen so operated serves to disconnect relays 910 and 911 from thecontrol relay associated with the keyboard. Y

Relays 912 and 917 are looking relays and serve to shift the variouscircuits as will be described in detail later on. 915 is the test relayand operated in case the called for line is busy arid when so operatedreleases the -switch G nd connects a suitable busy tone signal tolthetrunk back to the calling sub- Scriber.

Referring to Fig. 5, the circuits shown are identical to that of Fig. 1and need not be described,

Referring to Fig. 7, each group of one hundred primary trunks will haveten relays 421, 422, etc, ten relays 431, 432, etc, and ten relays 441,442. etc. The first set of relays mentioned will have a common controlor master relay 471. This master relay when energized prevents furtheroperation of any relay of its set. The third set of re- .lays mentionedare controlled. in. a similar manner by a master relay 472. The relaysof the second not mentioned are provided with contacts connected to theunits starting conductors and have additional contacts for controlpurposes.

It will be noted that the set of relays 421, 422. etc, and the 'set441,442, etc, are provided with seriescontacts. These series contactsare controlled by the emergency -switch T whichscrves to change theorder in which ground is connected to these contacts. The

the relay opermore than one relay which I The switch T series contactsof the set of relays 421, 422 etc, are arranged to revent the action ofthe set 431, 432, etc, while the series contacts of the set 441, 442Fete, are arranged to prevent the action 0 more than one urits relay ofthe seconlary set Fig. 8. i

besides controlling the ground connection to the series contacts of therelays mentioned also serves to change the order in which the secondarytrunks are controlled or placed in order.

Referring to Fig. 8, a set of tens and units secondary relays is shown.Relays 521, 522, etc, are the tens rela s while relays 531, 532,

\ etc., are the units re ays. There will be ten tens relays and tenunits relays in each set associated with a secondary trunk such as shownin Fig. 9. These relays correspond to the tens and units relays in Fig.1 and serve to connect any one of one hundred primary trunks to aparticular secondary trunk.

Referring to Fig. 9, relay 552 is operated when the secondary trunk isconnected to the primary trunk and serves to control the lockingcircuits of the energized tens and units relays. 556 is the shiftingrelay and serves to connect the starting wire from its trunk to the nexttrunk in order. The winding of relay 552 serves-as a path through thetens and units relays are locked. Relay 550 is operated when the primarytrunk is finally connectedthrougl'l to the tertiary trunk. Relay'553serves as a cutoil relay as the hens and units starting conductors passthrough its back contacts. These starting conductors are connected toground through the contacts of relay 552 when it becomes energized. Rela554 is a locking relay and when opera connects the control relay 555directly to the tip con duotor 514,.

. Referring to Fig. 10 the control circuits for the tertiary set of ensand units relays are similar to the contigl circuits shown 1n Fi 6 and7. Relays 1, 452, etc., are com this set of relays is relay 581. hereare 451, 452, etc., and ten 572, etc. This latter set of rela s 1scontrolled by a master lay 568. ten relays 561,562, etc, containing theunits starting conductors and are controlled b the series contacts ofthe set ofrelays {L5 452,.etc. The series arrangement providesagainst'the operat'on of more than one relay of the set 561, 562, etc.The series contacts of the set 451, 452, etc., and 571, 572, etc, arecontrolled y an emergency switch This switch also performs otherfunctions in case of any undue delay In securing proper connections, theoperation of which will be described in detail later. Referring to Fig.11 a set of tertiary tens en relays in the set relays in the set 571,

tro led by the tens startin conductors and. co tro led by a masterhereare.

and units relays are shown. There will be ten tens relays 601, 602,etc., and ten units relays 611, 612, etc., associated with each tertiarytrunk or key set circuit as shown in Fig. .12. There \Vlll he one relay699 for each set of tons and units relays.

The ten tens relays Fig. 11, contain contacts to which are connected agroup of secondary trunks one of which is shown in Fig. 9. For acomplete set of relays there will he one hundred secondary trunksconnected. As each secondary trunk, Fig. 9, is capable of serving onehundred primary trunks it follows that a tertiary trunk has access toone hundred secondary trunks or one their sand primary trunks.

he grouping of the secondary and pri mary trunks can be arranged to suittrafiic conditions.

Referring to Fig. 12, the main circuit of the tertiary trunk is shown.Relay 668 is operated when the tertiary trunk is con nected to thesecondary trunk. The opera tion of this relay lights the calling lamp701 and the guard lamp 702 Fig. 13, notifyin the operator of a call. Theoperation 0 relay 668 causes the operation ofc'clay 663 which serves todisconnect the starting conductor from its trunk and connect it to thenext trunk .in order. 660is the answering relay for connecting theoperators tele phone set to the tip and sleeve conductors. 661 is thestarting relay and serves to place the switch controlling device Fig.13, in operation. The circulator or emergency switch is shown at S, andonly operates under abnormal conditions and serves to change the orderin which the various tor-- tiary trunks are placed in order.

Referring to Fig. 13, the operators keyboard and control device areshown. The keyboanl consists of five strips of buttons, ten buttons toeach strip. These buttons are of the usual locking and indicating type.

en any one button ofa. certain strip is pressed it will release thebutton formerly depressed. The buttons (08, 704, and 705 are not of thelocking type and only close their associated contact springs when thebutton is held depressed,

The switch X is provided with three of contacts and wipers. Thisswitch'to shift the stepping 0r tip to sleeve as'the ease maybe-liq? connectthe strips of ice j :35.

proper order. One set 0 "contacts;

associated wiper is used fdr'f' I) switch to its normal conditibm Theswitch x is prqitilled of bank contaetsand'atfitlflilt determines thennmbeg oj lector andconnectofsw' lg k The number of steps are detcrmiqbuttons depressed in the various Relay 718 is the control relay-w ch inno

